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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cf9320bf21b66343325bb9c4639adde7f05f6ac18df1f05871da0512619e8c' 
  AND token = 'QR8r/LgMlUozYjyu3uz85MnXPmnBe/cV6vAga6ax0mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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