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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc2549f6b17ee072f995f86ee5247d489b1b0718012cea10340773884310265' 
  AND token = 'uJ94qaor1Mkwdwp2dG3Iv6pc0jhph6qxV7OUsCNH3jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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