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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aabe5347911ad2286d555ebba6d5f150b68060c54180e43477a42f7089d3738' 
  AND token = '6yjc8dgDCJjc+aMdNEk9YhNBihsmGi3emTPrRD8lGZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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