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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681944587e695a09a7e2e4287be41ddae4aa233bc6f144d530ab4f3ec70d9acd' 
  AND token = 'rxW4sP7s8d+c70QQjvSmESCP1Myv9aormHBT1kHrEA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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