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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d7244b6cc2f8b1d6a3e77c5706e7054df9c7d1c4fcebe20d30a71621215fbc' 
  AND token = 'qa32fyXEe+8PwrXhg03vx4HKPtOLk0NnsDgu+9JQpIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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