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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990443b839e37ccbd96407238171989a98d73b83a529db629db7afe57896ca50' 
  AND token = 'l7keN9M9KqB7MLacWzwdxkEUEdMbXkVzAi1jCH+XqEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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