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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969f7019c78ee98cd9811b3126c5847684c24c89a68bb3c8be35a4d4003b7ff6' 
  AND token = 'bvtr8hpNf+4eDXmJHrs6LwTkFJls5mQPExATHG0sGHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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