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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0479d36767aef8308d2d287d1f169106c6e24c7009689a53fa25635c6e3d091' 
  AND token = 'N5fj55R+8d0UKed0DOv5gK8LwKHuQW3xJLun3fT43s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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