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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22bcc599b881ba242f030d16b6a1ea153218ba4ca314c54aa288a3ab6eaae0d' 
  AND token = 'BY0rorpwMcAFtRlLSjBf3/tvoZjRlfrr9WRpUgZGTH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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