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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ef5d3c44266bfcbfb121979f4e9a538e604b14f4caefdc9602b994b9dbc38f' 
  AND token = 'l+X43yInw2X4/tnm2ZF27f7zGNualSVXpW7K0JGnpGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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