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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1dfe377b31ca698053abb7c4f8ba5d93bd861f007efee090449f88699404368' 
  AND token = 'kM5FHp0JDJPRsRwHf4+t/2G9JY93Or9GdHURdBuzEvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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