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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7d3d13025b167a96834420bb8cde33aece0700528a56f2349c120968883bb3' 
  AND token = 'cOclwDWykIhZhdTt9VLv4MThqWy3+YCOYiPcIJRn49k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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