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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f923441ee174320cf23ed613638909933f7d3eedd1e61e08036a36e0a7e6957' 
  AND token = 'MtVu5GLcfuYaTB+L3ec+2PGNYyoh+CYlB3UAfOY5SOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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