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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd5e67117e877e981bd8cc0fd47ce7aa5e374d5f7104439bad708a7581da0bf' 
  AND token = 'rE1yljumM3BoXaRoxzX4nu7OrZ7IeUF5RwgGDplcThA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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