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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe148eb534d8deafd0820113e72a31d21acb8ba005c2344f5ad54139f8d9d961' 
  AND token = '7LkQEKbrSXuDc6p0156zdQajTkMTQOgCMX9QCUAv/6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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