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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605e98a8bc931387700ecd01888ae3b0d2700d64c16b760dc7159280a3ea4880' 
  AND token = 'vJHdrx5BGxkaJaIsj4M6v5bXPxZxTkAC3JSU/Pepb/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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