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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2da59dc57e11db4883389a2750608fcd20c59e4ade433cd86e12f135555e1e' 
  AND token = 'ZFqEaJeat6I4NkSqaP5R5X4Y9j6iEesEyU3qOUbNLeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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