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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868518a2879b1b98ba0f24543880eee011ffdb38c28be7712e04c1feb8dfdbb7' 
  AND token = '0HyifzBMzvLP+qdRvmK43BpsnkQCyb5++M8/r7Z8fek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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