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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ca0405c90697a4a9a26ec4efb06baa23eb31f50818a8229772b40e747a4218' 
  AND token = 'qRw0StTOElp3t4TMzOCmkfGtmwe1YN0RlH7PnstwcmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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