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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a1b6a32a1cb0fcfbf542ff0cad76ceb81bdf577bba05fdf485b885f2d89ca0' 
  AND token = '9+GxHAaelK61yIfh4zsJS2xbg+DEpWgoyGGQJOH9+fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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