SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9b9e034f43349cfb6e2cf14547af6360a002ff8deba31541f39bb65d6782bb' 
  AND token = 'X6auzpqDoii/21Zv25Xhky57/0NYuJjDIwtqZ63LCKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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