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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac153ba590befc9da04ce58d7ac6f1a9e825dc0ecd6e53cc33ad7b3741d88aba' 
  AND token = '6Ep0QGcRxfjA7+/26EMYoOckwBIW9kfxVuEAxGWehjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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