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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba101e1e4850b5e6381d1ae75e698dfd8980ea9d11909e41278a6ac19d4df3f' 
  AND token = 'LzYuJj22pusQZ8ovNTJ8GR6GQ7axV9zhqhDhnaqTNiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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