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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a86637480e1276b76b8c84073ca1cd8abef339a8825da9858735e66d69c72fe' 
  AND token = '3ciqxsomC39oYkba9l2uiMZiuJOwhK1shUXlF7f2SLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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