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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26de9f61b166d4027be3106abb1c0e910092c63e9f2db65ac8ce065eae83b95a' 
  AND token = 'DzCNYJ5tpDaj9uxwA1fsceUX/eY3GRA/2iYb9OiX77M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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