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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5459b1c8f3e29fe04432447c235da97d38d96aeedce7de02232ab44a79ede5e' 
  AND token = 'Bvnw6XBK6BUDoOqm8lRTUET3l3VKyKAm18663CKfcVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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