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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f4354e57b2753bd36c3d59f230354597ee9c410e87128160f8626ee38d0fef' 
  AND token = 'TDlU53CLUA6bQtxuJPANC3aj2hGExq/07z7TUaO1p00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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