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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd539423c6d14f9e84c3c72b52a34c7fa84483af4f937858feb61260bc2eecbb' 
  AND token = 'tQXipTA8MeVyzsvo1kWwydGSeD1IhZLG2dQss/PoyAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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