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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8117e4af85b275955bff8b3d65ba6befd6e4a9fbfbfa0685d65860f1f9d53d' 
  AND token = 'ZN97WW5C0BSvDQoU/egKWb2XNpFT4UM2w96CCM3beFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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