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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8b56aba646bce4718d2d085851956d730df2dd55f89c6245a05ae894db7927' 
  AND token = '3ayQpWIwNMrbgUt7optofD32eL7Hj9QHgQ7qcmpZunI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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