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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c0495c662bf7bfc6e016b64fe25c7dded337411ffbe7cbba7f491ef414ff96' 
  AND token = 'z773FKfEZG/hXfZGALj26rcqPQ+lUCPbo4cvU68WCQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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