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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69375a3adcd17b6f2a7c30e341fdd16562a886579ef733987eb04760bd31bc3d' 
  AND token = 'S8s0jxi6aRARM0BSt0BxfXJzZnbxYvg2teABMs9FzTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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