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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090c49f5b52a20f06bd3dcd3f11103090b92dfad1302b0717e60e1bacf080df8' 
  AND token = 'RnDItGzyBJsolpgPyNhW2PaqF/6Sh89ZWraq9di3C4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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