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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b2552ab5e94bf535e8bd488d57327a23bcb28a3757c39d4ee8aa8389c88555' 
  AND token = 'pXC/E06o0naAP59Abu29yF8DqgoxyvZQyrNIA7EgAac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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