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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d13b73369f68aded57f67d854d71a22281ec395674796a2ae1809891d8a53eb' 
  AND token = 'W3HVpeikb4FdJi5S1ZmKcj6Uth3ZDgQLNI4ixyktzY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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