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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcf0dfe15d6da14a463e3b025b843a0e969153b597772410beb743223d9a03c' 
  AND token = 'eYnarbgcdk8tcngT8L1+DP2QlhN29k76ubNalMRSGAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}