SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94fa4facab75219680c3ff045f757bb738166a6f5401e1b827dbe859850c1367' 
  AND token = 'kE+zZyex1F8F0Afn6kXbcTpL4+t8cq6NO6r62tL/l4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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