SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b5457ff16e95a5e2dade1259dcbc470783c13ceb99504205212fec3b8edb10' 
  AND token = 'wzjQxPz67dhcGSLQsZK/WvFF3+zjplGqeSApAfHds7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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