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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a88a93c107777aab84825c755027860e11adfdaa5fc39a3dc18741dce956c3' 
  AND token = 'U9MUITOTiajDwbpdoboHu87eA2q2Wr/pQ4atNlROE7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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