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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e78f65a4aeb2825e21b933a039a530050d575256c04035a87bbef0744803a8f4' 
  AND token = 'WFvVhFxbSyUr7O+Aofgzdbe6p1APlAxzQ+lwP4qDmZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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