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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd18e2774a476d5483669d9327f4f7f51932b79b8448ae17172f018d2f395bfd' 
  AND token = 'slbGeA9NlQvY4cfuiKClO36pqU0t11WCO6xyQMHlLhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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