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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0e18efb75d6f374b9e5d496d78ddb3aae5910852760b87234d03dd2af7ee8b' 
  AND token = 'Ew/7jYBui+9ggG8rP5nDkHi+nyrqNwoz+Lm9iIadeGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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