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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4664d665d82136187ecdd94cb3c7a5701a67a44cdf3698bc6ef337ea040a96bc' 
  AND token = 'rBUfXa3XzbzXsiEUOuVVrplSOT3RX7vyHhzEhYg1Xfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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