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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd158bee3dec9fd14a7d61a3f8efa01db64204459534cf87e3fc5f45285a31bbc' 
  AND token = 'Q60RAoZD9WGG+ML8NSUEQF4KmNpbONEOfJc6qH5isdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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