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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f28fae49059bda321375d08f14b20bfc743667d0bd367fb0140dc6e87c493a4' 
  AND token = 'Biir91SxvHEI0XFumayOQFCm4DnYy/U1Kvk3ae9Nkn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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