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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c23ecda0e2ac5e4b654cc61cbaef8eb18e2292aff4be074a064786b87265c3' 
  AND token = 'zrI/lP+7uEcIxXqBqEgOXkUWe5pq0qsjYtX9fF5pv4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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