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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3967269b1247c0ffcd1bd9d58dc571084c8ce9ea03a0bdc7b2c90ac3548c5f' 
  AND token = 'tYr2HDRQ3hToxWk0+O1YeX7vHzv8iYsUJyWGD2pkOwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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