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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f6b7c464a93c44bb5c87ddc439eb80891358460d585d8e5a5e9add4aa11f13' 
  AND token = 'SiOTjdZpQT9GdReQfS5y7SyZppYfLFZO4A2MBkXcnXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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