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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '529013c207a4319dee57f0f3b69a7ac25a12bd1ea06b4aa94014a05462646792' 
  AND token = 'eUR8dkJq6+HJ1aY3+z2gbkm7XYaD7O8gvavu3WD7tcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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