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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b441c21d13192d300f308c9ff15c87f39b2c2c5aa7ba4abb8b5b61462fb270a' 
  AND token = 'l2fcDjJBt2KZgaIXIIvpeNsycIkb8yjKJteiS9Guxrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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