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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2782f348e4ca54d2a4e432c63c606344a9901cc221ec13cff80fe22f0dcd9c4' 
  AND token = 'i1fOY4FSAw9p99YsSNfaqSywbucVzn+3U6sSt1ibY+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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