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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9fbf0df18efce0c425a3e132d079c6870de88e95d45fd8ed6200595b1566070' 
  AND token = 'A7w+QXEco98ErFAs8a7z5LkxTFN/GRNAZMtgc4Iik4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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