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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe08bdccd9044a56b39f7526502fde8272d16f6819bccc5a0d47d5c30957597' 
  AND token = 'XX8atv9hBFpNFsxLUuN95/P7ci5WPxUE7QZD973G0as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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