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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf88779eb7c8c3196666b3ed9e2c28c94799ec1e20fc08679fe5ec8497b8b5b4' 
  AND token = 'YAPUS2D92/7l2HtVtnhCCqwpzOpJ7SKgY8SJU3dXYr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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