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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35590f543b9efaa8cb6c907a5012f4cef1c6514a3cd55ecfb4eb8ce172bcd71d' 
  AND token = 'WHphx8sHaXLXpGvph456VeyX+gQuVsxXsA/WvIvnVM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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