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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c36db19bf5fada0c94836ff4bc38925b74afdfd49ccfed6713a84b5ebf2b130' 
  AND token = 'KTHorkHvibJ/F5AqW/D3P3pDOoWyRC9LALCc7wwVxQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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