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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc694bd2c2c2c45f0b7b5fa99e21a5ac975c0859731e05a224627c7badcab80c' 
  AND token = 'RkdFnAoDDNq/DsGoUcgvc05PSVr9kxIp+pWCh2w86w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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