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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aedae9aedc47cf94450de947e5b03b0f00d28021fbc7e32d459617c4be43f76' 
  AND token = 'Y2e0c4JF0H7BF5X2qieSQ85GRTTKz/ytrOHou0hY+zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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