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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92006b803f5848974926c0374e6c674e7e3fd96e74f6bbac06fb677a2e3324d2' 
  AND token = '2/zhP9r3ursGU41l+5QYK5rYdno8WnTbv30IYmFpexI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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