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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9552aaa8acc517b2e656c7d1a4e87ef9c1af301afc48697e820c03d430a3772b' 
  AND token = '2zq121nxiHB+/O4m1Z4KT9m3vxwgde+6nheKgEHtkb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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