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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd017960d19149634d92ac5c53d9d08402b6766411ddf5b4e39becc83429d390' 
  AND token = 'M+ojwvzzYIK3HoHZ/xgsAo3Xqo51zEr/csnBxPyA5DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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