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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a6ee03952ad723648bbc8a25d2bc2f34a15c074bf2f0c83545e62922564835' 
  AND token = 'DCbrvZN24mZ89l9qkdn2qGaBWSqwKxNqs4apqtfJM5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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