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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021be54241456980c719ae7fba5dbbde33c8af4399d101a2e926762d9bef613d' 
  AND token = 'e2c6N/9nCQjOKjtUGxC/L+6mk9VG47HsBmMeBumZZbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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