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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f63199b55c5478fd82384554eefe3e8dd9fe01a329bae3e2f5f01b7e9b38ef' 
  AND token = '9YoD5qRcH5O0L92nM84Idv59/mnT+I7I8CEuTOTgA2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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