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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b543a1704972228ddc77ebe652df4d373e405bedab4a5c60dd198659eb5acf' 
  AND token = 'sUdU6d09kbuiT0/d4Ch4uNbM5KSvmitiE9Y45nlj69U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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