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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707f65e523a1f86c25f247f3210d70f57abee231ccb06a99e2ad5660cdbb4797' 
  AND token = 'Iio06aNg1+7uTKncI9XDo5KS2Po3FSFgsgTR5hQwEWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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