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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc00bfa4c279a2291079d78f3518dc79db03b6a7da2b0b5b417ec6c92d8a363' 
  AND token = 'hRd+pUut/3n9CeXV8ANSb0GUtr2nnSW5swky9Duhjlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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