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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8461a78e062f3313a4446fc3b2ed2b04f259ad58bd1496f3ab6d6ed1ae735c' 
  AND token = '6FTBZ5Glqy37/6trH9onorNBKbC398drR4h5BvhzMPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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