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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a436a1354a30704698bb2d6aaeaf26f63609dfed4bd2515b8430de2a3ae1b74e' 
  AND token = 'J2b1GTaoA1eSwWNRCyba6c3K88Wuw/7W8NkeglsqJ9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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