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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be1ecf43e0586e0bfdabaeab16fbc80eccf955841d17e8a3ce78542b8824d9a' 
  AND token = 'fpatUlGm8+KzvgMpjJk9OQceFQoAK0no1qTgx60kCaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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