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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19b53073178758171135856cf1b25434ae41adc89ed44ca3a1ba3ac5338e584' 
  AND token = 'c6uRn+hp3RO6W1nLTCrSxBIBQEenR/A3SypAlLFiovQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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