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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fefb97bbc1849055ec518b53de5702742cc9aeb28a02326691f490253e39dc' 
  AND token = 's76rtDYNTSZo9zCb0oEm0wilXCMcUu+qAZQDw4cql5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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