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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f888cb8b23e050f92ec571405bbafac376fe3f1ea7b40f7d82908a948f77758' 
  AND token = 'bg0MdoMMPeyJvGDHAI+S0qWBZTdMjlggZgrir2g+yl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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