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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339aace8478b393acc25640f69c549994931d31ab1b2fe85a9c54e0c7d74715c' 
  AND token = 'nu0T2CcnLH91mn6TDVzfl2BgAonLVm2gy/TzSFz56Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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