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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b3d0ce26044fd3b04ef3fc248dd325adbf2fc16a56860fd3cc7603e927370b' 
  AND token = '7aB08Zwq1Sy9Rh5LDGVCVEZI05Sd0Njvk1dDnE1AMVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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