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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97950c4a3469a9762f7e0bfa0f3e42f117a29e3c5dbccd9b82cfb84e08956537' 
  AND token = '9innckibEtxP2i0HG2qtj/GllnBOToi3tWPwIbqPMZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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