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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ba446773152c5990c4db91e1eaedbeedda95f5b16af58d389cef5ac9208d9e' 
  AND token = 'cUFH3IULbRHOi3iEZj27+V7Z25B8LE7tWrOwJfEPHCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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