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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2782c59423b7c4083706cb3927270e6f808ca9334349ac6f509b70da7cda5a' 
  AND token = 'fV4YUcof1lKts5dG5Kd1AOuiqHvrk5EJq5f/P9gGIYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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